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Preparation method and application of MXene-based inorganic particle/PVDF-based polymer composite diaphragm

A technology of inorganic particles and composite separators, applied in nanotechnology for materials and surface science, non-aqueous electrolyte batteries, structural parts, etc., can solve problems such as shuttle effect, achieve inhibited growth, uniform and continuous film formation, and Processability

Active Publication Date: 2022-08-05
宁波民光新材料有限公司
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The purpose of the present invention is to provide a preparation method of a polymer composite diaphragm and its application in lithium-sulfur batteries, solve the shuttle effect of lithium polysulfide and the problems of lithium dendrites, and achieve the effect of improving the performance of lithium-sulfur batteries

Method used

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  • Preparation method and application of MXene-based inorganic particle/PVDF-based polymer composite diaphragm
  • Preparation method and application of MXene-based inorganic particle/PVDF-based polymer composite diaphragm
  • Preparation method and application of MXene-based inorganic particle/PVDF-based polymer composite diaphragm

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specific Embodiment approach 1

[0030] Embodiment 1: The preparation of the MXene-based inorganic particle / PVDF-based polymer composite membrane of this embodiment is carried out according to the following steps:

[0031] Step 1: Preparation of spinning solution:

[0032] Dissolving the polyvinylidene fluoride-styrene sulfonic acid copolymer in the nitrogen methyl pyrrolidone solution, stirring for a period of time at a certain temperature, adding a certain amount of inorganic substances to obtain a spinning solution;

[0033] The inorganic substance is Ti n O 2n-1 -Ti 3 C 2 , Ti n O 2n-1 -Ti 3 C 2 The preparation method is as follows: the Ti 3 C 2 MXene was heated at 200-800 °C for 5-30 min, and then naturally cooled to room temperature to obtain surface-grown Ti n O 2n-1 Ti 3 C 2 Mxene, i.e. Ti n O 2n-1 -Ti 3 C 2 ;

[0034] The polyvinylidene fluoride-styrene sulfonic acid copolymer is polyvinylidene fluoride grafted with polystyrene sulfonic acid, and the graft ratio of styrene sulfoni...

specific Embodiment approach 2

[0045] Embodiment 2: The difference between this embodiment and Embodiment 1 is that the inorganic substance in step 1 is Ti n O 2n-1 -Ti 3 C 2 , Ti n O 2n-1 -Ti 3 C 2 The preparation method is as follows: the Ti 3 C 2 MXene was heated at 200 °C for 30 min, and then naturally cooled to room temperature to obtain surface-grown Ti n O 2n-1 Ti 3 C 2 Mxene, i.e. Ti n O 2n-1 -Ti 3 C 2 .

specific Embodiment approach 3

[0046] Embodiment 3: This embodiment is different from Embodiment 1 or 2 in that: the polyvinylidene fluoride-styrene sulfonic acid copolymer in step 1 is polyvinylidene fluoride grafted with polystyrene sulfonic acid, The graft ratio of styrene sulfonic acid was 20%.

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Abstract

The invention discloses a preparation method of an MXene-based inorganic particle / PVDF (Polyvinylidene Fluoride)-based polymer composite diaphragm and application of the diaphragm, and relates to a polymer-inorganic composite diaphragm and application. The invention aims to solve the problems of shuttle effect of lithium polysulfide and lithium dendrites. The preparation method comprises the following steps: dissolving a polyvinylidene fluoride-styrene sulfonic acid copolymer in a nitrogen methyl pyrrolidone solution, stirring and adding a certain amount of inorganic matters to obtain a spinning solution; injecting the spinning solution into electrostatic spinning equipment for spinning, and then drying to obtain a polymer composite diaphragm with the thickness of 30-120 microns; an organic-inorganic composite membrane is constructed by utilizing an electrostatic spinning technology, so that the comprehensive performance of the Li-S battery is improved. The space steric hindrance effect of a PVDF-based polymer diaphragm frame and the high-active oxygen vacancy synergistic inhibition shuttle effect of inorganic particles are utilized, and meanwhile, the two-dimensional nanosheet structure of the inorganic particles is utilized to shield large-size pores existing in an electrostatic spinning membrane, so that the mechanical strength of the diaphragm is improved, and the growth of negative electrode lithium dendrites is prevented.

Description

technical field [0001] The invention relates to a preparation method and application of a polymer-inorganic composite diaphragm. Background technique [0002] With the development of 3C products such as mobile phones and notebook computers, and the increasing demand for high-power system products such as electric vehicles and hybrid vehicles, lithium-ion batteries will continue to be used in the future due to their limited energy density and low safety. restricted. Lithium-sulfur batteries (Li-S batteries) due to their high specific capacity (1672mAh g -1 ), high energy density (2600Wh kg -1 ), low price, abundant reserves, environmental friendliness and other outstanding advantages, it is considered to be the most promising high-energy density battery system to replace lithium-ion batteries. [0003] At present, there are two key problems that need to be solved urgently before Li-S batteries can be practically applied: [0004] First, since the elemental sulfur is S 8 ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M50/446H01M50/426H01M50/44H01M50/443H01M50/489H01M50/403B82Y30/00H01M10/052
CPCH01M50/446H01M50/426H01M50/44H01M50/443H01M50/489H01M50/403B82Y30/00H01M10/052Y02E60/10
Inventor 赵立杰顾晓华孟璐贾宇冲汪建新于海霞赵桦萍
Owner 宁波民光新材料有限公司
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